Improvement in balanced valves



. H. STM BS.

Balanced Valves.

No. 143,193, PatentedSaptember23 ,1873.

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l Wv'ne se@ I UNITnp STATES PATENT CFFIGE.

Josnrn n. sToMB's, or wrNoNA, MINNEsoTA.

lmPRovEMENT IN'BALANCED vAlvEs.

Specificationforming part of Letters Patent No. 143,193, dated September23,1573; application filed March 24, 1873.

To all whom it may concern: l l

Be it known that I, JOSEPH H. STOMBS, of Winona, in the county of Winonaand State of Minnesota, have invented certain new and usefulImprovements in Balance Slide-Valves and I do hereby declare that thefollowing is a full, clear, and exact description thereof that willenable others skilled in the art to which it appertains to make and usethe same, refer-4 ence ybeing had to the accompanying drawings and tothe letters of reference marked thereon, which form a part of thisspecification.

This invention has relationto steam chests and valves known as balanceslide -valves; and consists of a hollow valve, through which the steampasses to the cylinder of the engine by means of the ordinarysteam-ports.

This valve slides upon the valve-seats of the steam-chest, as is` usualwith such valves, and has at its top an opening for the passage ofsteam, and a seat upon which a packing-ring rides. This packing-ringlits inside of a cylinder, and is held to its placeby a follower andspringor its equivalent.

In the drawing, "Figure l is a side view of my improved balance slide-valve; Fig. 2, a longitudinal section thereof Fig. 3, a top view of theinterior of the valve chest 5 Fig. 4, a detached view.

A represents the cover to the steam-chest. B is the hollow valve. (l isthe valve-seat and chest-bottom. D is the case or sides of chest. E,Fig. 4, is the transparent cover to the opening in steam-chest. F is thecylinder in which the packingring a and follower b are held. e is arigid cross-bar, througlnwhich a set-screw passes to hold and adjust thespring d. h is the valve-stem, and g the yoke, by which the valve ismoved. y

For an engine-valve the inside diameter of the cylinder F is madeone-third larger in area than the areas of bothreceiving-ports 7a k, toequalize the back pressure of steam from the cylinder when cut oft' bythe lap of the valve or link motion.

Through the opening n steam is admitted, and by its pressure serves toexpand the packin g-rin g a so as to fill the cylinder F and form asteam-joint, and also serves to force the rin g a down upon the seat Catthe top of the valve B. From thence the steam passes, as representedbythe arrows, through the opening t, which is equal in area to one ofthereceivingports 7', into the valve B; .and as the valve B is moved to theright 'or left one of the ports lo is opened, and the steam is admittedto the engine-cylinder, the ports lc la and k being in allrespects thesame as are n'ow in use." Uonsequently, this valve and packing-ring lmaybe attached toordinary steam -chests now in use.

The ribs ff serve as guides for the valve B, and slide against Vthesides of the cylinder F.

This valve is applicable for a throttle-valve, or for any other purposewhere a balancevalve is desirable. As a throttle -valve, the area of thecylinder F is made equal to the area of both ports or openings for thepas'-` sage of steam, as there is in this case no back pressure.

The packing-,ringe is drilled edgewise its entire width, and thenI cutopen tangentially to the inside circle ot' the ring, the cut passingthrough the center of the hole, as shown in Fig. 4. Into this hole thepin a is fitted, and its head let in to the edge of the ring so as tocover the opening, and thus make a perfect steam-joint.

By the employment. of the pin a', entering the split in the ring a, thelatter can be held in a iirm position, and produces a perfect and tightjoint between the surface c of the valve and the top of the chest.

Having thus described my invention, I clairn- The hollow valve B withits ports j j, eX-

haust-cavity m, seat C, and ribs f f, in combination with the packingring ,follower b, spring d, and cylinder F, substantially as and for thepurpose speciiied.

`In testimony that I claim the foregoing I have hereunto set my handthis 12th ,day of March, 1873.

. JOSEPH H. STOMBS.

Witnesses:

F. (l. BRYAN, R. B. Balears.

